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Address: Address: N0.1, Dongli Road, Donglai, Zhangjiagang City, Jiangsu Province, China
Contact name:Sandy Chen
Zhangjiagang HuaDong Boiler Co., Ltd. |
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Temperature Resistance Steel Superheater And Reheater For Pulverized Coal Boilers
Description of Boiler Superheater and Reheater
Superheater is a part of a boiler that heats the steam from the saturation temperature to the overheating temperature. It is also called a steam superheater.Superheater can be divided into convective type, radial type and semi-radial type according to heat transfer mode;According to the characteristics of the structure, it can be divided into serpentine pipe type, screen type, wall type and wall type.They are made up of parallel pipes and inlet and outlet manifold.
Most industrial boilers do not have superheaters because many industrial processes and living facilities require only saturated steam.In power stations, locomotives and Marine boilers, superheater is usually installed to improve the circulating thermal efficiency of the whole steam power plant.
Details of Boiler Superheater and Reheater
• Superheating raises overall efficiency as well as avoids too
much condensation in last stages of turbine which avoids blade
erosion.
• The heat of combustion gases from furnace is utilised for removal
of moisture from steam and to superheat the steam.
• Super-heaters ususlly have several tube circuits in parallel with
one or more return bends,connected between headers.
• Heat from the hot gases to the vapour in the surperheater is
transferred at high temperatures.
• Therefore promary section of superheater is arranged in
counterflow and secondary section in parallel flow to reduce the
temp.stressing of the tube wall.
Differences of Boiler Superheater and Reheater
| Type | Advantages | Disadvantages | Supporting method |
| Pendant-type | 1.Firm structural support | 1. Flow blockage by condensed steam 2. Needs slow restart to purge the water that accumulates in the bottom. | supported from above |
| Inverted-type | 1.Proper drainage of the condensed steam | 1. Lack the structural rigidity, especially in high speed gas flow | Supported from below |
| Horizontal -type | 1. Proper drainage 2. Good structural rigidity. | 1. They do not view the flam directly so they are mainly from the convective type | Usually supported in the vertical gas ducts parallel to the main
furnace. |
Functions of Boiler Superheater and Reheater
1.Superheater is the saturated steam heated into a certain temperature of superheated steam equipment.
2.After the saturated steam is heated into superheated steam, the working capacity of steam in the steam turbine is improved, that is, the useful enthalpy of steam in the steam turbine is increased, thus improving the cycle efficiency of the heat engine.
3.In addition, the adoption of hot steam can also reduce the steam
exhaust humidity of the steam turbine, avoid the corrosion of the
steam turbine blade, and create favorable conditions for the
further reduction of steam exhaust pressure and safe operation of
the steam turbine.
Company Introduction
Established in 1985,Zhangjiagang Hua Dong Boiler Co.,Ltd.(trading
as HD Boiler),produces power plant; industrial; waste heat; waste
incineration; biomass; organic heat carrier and electric steam
boilers. Coupled with a comprehensive range of heating surfaces, HD
Boiler brings to the market a unique service including boiler
design , fabrication, installation, maintenance and replacement of
boiler pressure parts.
1. Fabrication area of 200,000 square meters
2. 150 Engineers
3. 600 Coded welders
4. 60 Licensed Inspectors(NDT Level-III instructors)
5. Class-A Licenses for Design and Manufacture Boiler
6. ISO 9001:2008 Quality System
7. ASME Certificate of Power Boilers
8. ASME 'S','U' and NB stamp authorization
